OP, you're not even 40 so how is that 'too old'? In all likelihood you're probably less than half way through your life. Would you genuinely be happy spending the next 40-odd years without a partner, especially after your kids leave home?
Your tone of voice sounds quite low and down tbh - 'resigned to single life', 'not worth trying', 'opt out'. You say that being single is preferable to the alternative - what, in your opinion, do you think the alternative is? You say you have plenty of time for your kids, to go to cinema and read etc - a good relationship will still give/allow/enable all of that too
.
Do you think you could be depressed or socially anxious? I only ask because I've been single for nearly 9 years and until a few years ago I felt like you - I could have written your OP back then and probably did. I didn't really date much if at all, I felt resigned to singledom and couldn't be arsed to make the effort to meet new people, male or female, and preferred being cocooned inside my comfort zone. I then had CBT for stress and anxiety and through that it came to light that I was very socially anxious and lacked confidence, and in order to protect myself I declared (to myself and others) that I wasn't interested in meeting anyone, cba to go out, was happy by myself etc. CBT helped me to work through how I felt and what my fears were and slowly I started to have a more balanced life. I haven't met the man of my dreams yet (not sure he exists
), nor am I out on the lash every night of the week, but I've been dating on and off, going out with friends and colleagues a bit more, attended a few courses, workshops and seminars alone (which I'd never have done previously) and joined a running club.
If I meet a decent man then I expect that a certain amount of 'compromise and work' will be necessary but I'm in charge of myself, so if a relationship involves too much compromise or becomes way too much like hard work, then I have the option of ending it. That said, meeting a partner was never my main intention or my sole reason for the for the changes and improvements I've made - deep down I wasn't truly happy with my life but I was in denial. My main intention was to improve my life, make more connections and challenge myself a bit. I no longer reside full time within my comfort zone and life is much more enjoyable now.
Just something to think about with regard to your own situation but you will need to be completely honest with yourself.
I'm 42 by the way, and I don't believe in 'too late'.