The grass is definitely NOT greener.Parents in REAL life don't even get to sleep most of the time cuz babies and toddlers keep them up.So when you rest your head on the pillow,just reassure yourself a screaming toddler won't be disturbing your sleep
You also get to come and go as you please without worrying about babysitters, or school,and other obligations.
Oh,and most parents won't admit this,but you have NO SEX life with young kids.
It is nice having a partner,but I also prefer sleeping alone.Guess I'm just weird though.I like the bed all to myself without someone kicking me or snoring in my ear
48 is still young.You could get married or have kids anytime.I know people doing all those things at 60.Don't give up if it is what you want!