You’re never too old and it’s never too boring to make it fun.
Every voluntary activity can be made fun.
That is an extremely high standard no one can actually achieve (and most wouldn’t want to), but there is no law of the universe stopping it from happening.
Once you realize that, the onus is on you to figure out how to make it fun. That challenge alone is the beginning of the fun.
Fun is not a moral good in itself, but if you can make life fun – especially the drudgery – it’s pretty dang hard to do a bad job at moral goods. Fun has a way of chinking the armor of bad habits.