I think the original post is addressed to students, but, below, I give my example of how an old dad leads a boring but happy life.
Wake up at 6 am. Shower, make two sandwiches for my lunch. Wait to see if my wife, a high school physics and math substitute teacher, gets called into work.
If wife does not get called in, leave at 6:50 am, walk to coffee shop and have tea and a spot of breakfast, catch bus to work, and get to office at 7:50 am. Work on my own physics stuff for a while, and then start actual work.
If wife does get called in, then I have tea and a spot of breakfast at home, help get my seven-year-old daughter ready for school, walk my daughter to school, catch bus to work, and get to office at 8:35 am. Either work on my own stuff a little, or start work straight away, depending on how busy I think my day will be.
Arrive, by bus, at home at 5 pm, although sometimes I have a teaching schedule that makes it a little later on some days.
Have supper. and then do stuff with my daughter. Now that the weather is nice, my wife and I often go for a walk while our daughter rides her bike. Put my daughter to bed, and the do a subset of: read a novel; watch a murder-mystery movie with my wife; surf the internet for local, national, and international news and sports; work on my own physics stuff. Go to bed between 10:30 and 11 pm.