I don't do any of that. Parents passed - mine and DH's - over a decade ago, and our adult DD have both left home, so no childcare. Also no sign of grandkids yet and I won't be their full time childminder when they DO come along. I will help but won't be used as a free nanny. And I volunteer for nothing, and help no-one (except in dire emergency.) Work from home 20 hours a week, and intend to retire in my early-mid 60s (around. 62-63.) (Currently got around 10 years to go.) I have hobbies and interests and friends, and enjoy my life. I deserve it.
So yeah, even though I am not a Community runaround, and anyone's little helper, or personal servant, (and never WILL be!) I still ain't doing national fucking service when I get to 65. AIN'T GONNA HAPPEN! Nor am going to volunteer for anything. I have earned my stripes and paid my dues (and taxes) for over 35 years (and will continue to do so for another 10 years.)
Along with working since I was 16, (over 35 years,) I looked after my parents when they were old and ailing (and DH's too,) and have raised 2 brilliant, talented, hard-working, high-earning daughters. Unlike people in their late teens who have contributed fuck-all to the economy or the country. So yeah, under 20s who are NEETS can have national service. (It will do them bloody good!)
The idea of sending pensioners out to do national service is as batshit as telling people who were off work for 4-6 months - some 8-10 months, (during covid lockdowns,) and received furlough money, to pay back all the money they got. OP is probably a flat-earther and covid denier too.