I don’t have kids, but I do have a partner. Nonetheless, such large questions no longer consume my spare cycles. Obviously there are many exceptions, I wonder

I don’t have kids, but I do have a partner. Nonetheless, such large questions no longer consume my spare cycles. Obviously there are many exceptions, I wonder if on average interest in such questions peaks. If so, does the average peak coincide with an age or a period of life. Do we lose interest in our late 20s/early 30s, on average, because that’s when we have kids or is that just how long it takes for people to get bored with contemplative pondering? I sort of hope it’s that having kids, a partner, a more challenging career soaks up the extra cycles. But even without those things, I find my passion ebbing. I worry this is an inevitable part of aging.