Hello,
I had a similar arthroscopy in July to repair a meniscus tear, clear it out and look at my ACL ( so am now recovering from ACL reconstruction). The arthroscopy is very straight forward, I came home same day, four small scars from keyhole surgery which have now disappeared.
I had minimal pain although I would say it took about 6 weeks to get back to how my knee was before in terms of range of movement. I have then had the second major operation.
I live in UK and have two small children - the most aggravating thing was I thought the physio was far too aggressive in terms of what I was expected to do with no access to a gym and little time to myself with work and children and I seem to have managed fine by doing sensible exercises which I could do in the home. My physio for my current operation is much more gentle and so far much more manageable.
Hope this helps, basically I think this op is really not a problem but take your time to do sensible rehab exercises. ( I am same age as you also). Good luck with op!
Michelle