OldPilot I'm probably going to sound dumb, but what is alt?

I did read "Sex Starved Marriage" and I will look at the "Surviving male menopause" by Jed Diamond.

M53 H54 D17
M33Y T38Y
Bomb OW 09/09
OUT 10/09 BACK 11/09 OUT 01/10
WANTS TO R 04/10 BACK with OW 05/10
Wants to Reconcile 05/11 I said NO