Tough on Old Farts

I'm 68 and the Boss is 65, and we've been caring for our 5 year old grandson for 2 days.  He's staying with us while mom & dad are in the hospital with the new baby.  Sure is tough on us old farts, especially since the Boss is in constant pain because of her back.  (She's having spine surgery in 6 days) Sure am glad our boys grew to be responsible men.  I don't know if we have what it takes to raise grandchildren like so many others do.