The long view of three cycles

Life-Cycle Milestone Chart

Mark birthdays, paired crossings and the rare occasions when all three classic biorhythm cycles meet or fully reset.

Ages 70–80Return to my current decade
19 Oct 2066 to 19 Oct 2076

Your cycle crossings

39markers in this window
Biorhythm milestones between ages 70 and 80Six tracks mark birthdays, paired zero crossings, triple crossings and complete resets. Birthdays Physical + emotional Physical + intellectual Emotional + intellectual All three at zero Complete reset age 70age 71age 72age 73age 74age 75age 76age 77age 78age 79age 80 19 Oct 2066 12:00 — 70th birthday. A personal anniversary marker. 30 Apr 2067 12:00 — Physical + emotional. Both cycles cross zero together. 15 Jun 2067 12:00 — Physical + intellectual. Both cycles cross zero together. 20 Aug 2067 12:00 — Emotional + intellectual. Both cycles cross zero together. 19 Oct 2067 12:00 — 71st birthday. A personal anniversary marker. 17 Mar 2068 12:00 — Physical + emotional. Both cycles cross zero together. 29 Jun 2068 00:00 — Physical + intellectual. Both cycles cross zero together. 19 Oct 2068 12:00 — 72nd birthday. A personal anniversary marker. 24 Nov 2068 12:00 — Emotional + intellectual. Both cycles cross zero together. 2 Feb 2069 12:00 — Physical + emotional. Both cycles cross zero together. 13 Jul 2069 12:00 — Physical + intellectual. Both cycles cross zero together. 19 Oct 2069 12:00 — 73rd birthday. A personal anniversary marker. 21 Dec 2069 12:00 — Physical + emotional. Both cycles cross zero together. 1 Mar 2070 12:00 — Emotional + intellectual. Both cycles cross zero together. 28 Jul 2070 00:00 — Physical + intellectual. Both cycles cross zero together. 19 Oct 2070 12:00 — 74th birthday. A personal anniversary marker. 8 Nov 2070 12:00 — Physical + emotional. Both cycles cross zero together. 6 Jun 2071 12:00 — Emotional + intellectual. Both cycles cross zero together. 11 Aug 2071 12:00 — Physical + intellectual. Both cycles cross zero together. 26 Sep 2071 12:00 — Physical + emotional. Both cycles cross zero together. 19 Oct 2071 12:00 — 75th birthday. A personal anniversary marker. 13 Aug 2072 12:00 — Physical + emotional. Both cycles cross zero together. 25 Aug 2072 00:00 — Physical + intellectual. Both cycles cross zero together. 10 Sep 2072 12:00 — Emotional + intellectual. Both cycles cross zero together. 19 Oct 2072 12:00 — 76th birthday. A personal anniversary marker. 1 Jul 2073 12:00 — Physical + emotional. Both cycles cross zero together. 8 Sep 2073 12:00 — Physical + intellectual. Both cycles cross zero together. 19 Oct 2073 12:00 — 77th birthday. A personal anniversary marker. 16 Dec 2073 12:00 — Emotional + intellectual. Both cycles cross zero together. 19 May 2074 12:00 — Physical + emotional. Both cycles cross zero together. 23 Sep 2074 00:00 — Physical + intellectual. Both cycles cross zero together. 19 Oct 2074 12:00 — 78th birthday. A personal anniversary marker. 23 Mar 2075 12:00 — Emotional + intellectual. Both cycles cross zero together. 6 Apr 2075 12:00 — Physical + emotional. Both cycles cross zero together. 7 Oct 2075 12:00 — Physical + intellectual. Both cycles cross zero together. 19 Oct 2075 12:00 — 79th birthday. A personal anniversary marker. 22 Feb 2076 12:00 — Physical + emotional. Both cycles cross zero together. 27 Jun 2076 12:00 — Emotional + intellectual. Both cycles cross zero together. 19 Oct 2076 12:00 — 80th birthday. A personal anniversary marker.
BirthdayTwo cyclesAll three at zeroComplete reset
Physical + emotional30 Apr 2067age 70.5 · Both cycles cross zero together.
Physical + intellectual15 Jun 2067age 70.7 · Both cycles cross zero together.
Emotional + intellectual20 Aug 2067age 70.8 · Both cycles cross zero together.
Physical + emotional17 Mar 2068age 71.4 · Both cycles cross zero together.
Rare whole-life markers

When all three classic cycles meet

Triple crossingAge 29.1

All three classic cycles meet at zero.

Triple crossingAge 58.2

All three classic cycles meet at zero.

Complete resetAge 58.2

All three cycles restart in their original direction.

Triple crossingAge 87.3

All three classic cycles meet at zero.

Crossing versus reset

Zero is a meeting point, not always a restart

Every classic cycle crosses zero twice per cycle: once while rising and once while falling. Two cycles can therefore share a zero crossing without restarting in the same direction.

A three-cycle zero crossing repeats after 10,626 days (about 29.1 years). A complete reset, with all three returning to zero in their original upward direction, repeats after 21,252 days (about 58.2 years).

Difference between a zero crossing and a full resetThree sine waves cross the centre line together, while arrows show that direction determines whether the moment is a full reset.shared zero crossingdirection decides reset
What the mathematics says

Why these dates repeat

Physical + emotional

Their zero crossings coincide every 322 days.

Physical + intellectual

Their zero crossings coincide every 379.5 days.

Emotional + intellectual

Their zero crossings coincide every 462 days.

These are mathematical coincidences within classic biorhythm theory, which is not scientifically established. The chart is for reflection and entertainment, not prediction.

Continue exploring

Move between a single day, a month, a whole year or the longer story of your cycles.

Daily view Biorhythm Calculator Zoom into the physical, emotional and intellectual curves around a chosen day. Month view Personal Calendar Follow the three classic cycles through a focused month-by-month calendar. Two people Compatibility Chart Place two personal patterns together and explore where their rhythms align. Seven rhythms Extended Chart Add intuition, creativity, awareness and spiritual cycles to the classic three.