I think also wee bit more body fat nowadays for me compared to 2 yrs ago
Short dist nia..... heck even for cycling i dont go long distances per session compared to other cyclists....just frequent sessions. Those long slow high number of hrs (> 4 hrs) i also find it quite hard vs my kid.....like last Sun 9hrs with breaks, longest session yet but only 136km, my kid night time said can go out again if i want, i was totally wasted.

(Sat relatively short at 50+km)
I think maybe kids got really fast recovery, their 8-12hrs is like my 24hrs