I raised a kid in my 30’s and 40’s while I worked 2 jobs, I missed a lot.
Now I am fully retired, I have time for her. The poor girl is getting a lot of daddy involvement in her education. IMHO there is no better time to have a child than at my age, I am here for her (as long as I keep drinking coffee).
So for me I thank God every day for the gift of my daughter (and her tolerant mother). The downside being I will probably no be here for any grandchildren.
I too was part of raising children and feeling neglectful of the whole family since I was gone so much while staying employed for us.
For me though children are for the young but having a younger wife would help in that department but my wife of 40 years is just fine.