The biggest age group out there was either 25-40 or 25-45, according to the last census (let's go with the more generous range; I like it!) and this is what I generally observe with my own eyes . . . and there are lots of people older than that! It's no big deal. Frankly, sometimes it's hard to tell age out there, with everyone looking happier than usual, refusing to "dress their age" (so feel free to wear whatever you want, please!) and the markers of normal age and status discarded after the drive in, a cotton puddle on the dusty floor of a tent . . .
You do not need to use rebar for an average tent; 10 inch Coleman stakes work for me in a GuideGear Single-pole Wigwam (super easy assembly, very much like a tipi, really . . . roomy, and you can stand in it). I light the guylines and the (pounded flat) stakes at night, and they stay in so well that I need to remove them with a wrecking bar at the end of the week. I love, love, love my wrecking bar. (Fulton 30-inch; removes [Coleman] stakes really well; great trick for the petite dismantler, but don't rush and yank too hard, the end is sharp).
use rebar for my heavy steel shade structure because you do NOT want that thing flying up into the air; the rebar pieces are either 18 inches or 2 feet, and I need to pound a minimum of 4 rebar stakes--of course--but 6-8 stakes are even better. I top the rebar with pierced tennis balls so no one cuts themselves. I'm not the fastest rebar pounder in the world, partly out of caution and having seen a few nice rebar injuries, but will be constructing for myself one of the "pounding helpers" Elorrum illustrates above, so that I have a bigger striking surface. (Always wear work gloves!) Rebar is not necessary to pound all the way down. You might drive it in about a foot, leaving a foot of it out (tilting outwards slightly) and topped with the aforementioned tennis balls, Barbie heads, pop bottles, whatever. They make rebar toppers shaped like orange mushrooms but I've heard they get knocked off easily; no experience with 'em myself. Tennis balls are great, though.
. . . To get rebar out I just put gloves on and get out the sledgehammer and sort of knock the rebar around a bit and work it out of the ground.
I had a shade designed that I could set up myself if I had
to, which is always a good way to operate as far as I'm concerned. (I really enjoy knowing that I can deal if no one helps me). But yeah, people are pretty helpful anyway. Even if you're 5 feet tall you can pull something taut or hold something up a bit, or help tie knots, and then they can help you.
Then break for beverages.