Don't know if it's a mid-life thing (he has a 'big' birthday soon) or the effect of us now being empty nesters, but DH is constantly going on about things we did in the past and it's beginning to annoy me, as I'm very much a forward-looking person. Also I think his memories of some things are completely rose-tinted!
Facebook reminding him with 'on this day 15 years ago' photos results in him sending me photos on WhatsApp saying 'remember when we took DS1 to Rome, wasn't that lovely?' and me saying 'no, don't you remember, he had D&V for most of the week and we barely left the hotel and had no sleep...' 
He also 'finds' things/ memories in the cupboard e.g. a mug from an event 25 years ago that I've hidden and starts saying 'we should do that again' etc.