Great thread. I just want to say, it's getting more and more expensive just to keep things status quo. It's no longer about getting ahead and looking better.
Hair - now that it's short, it's cuts every 6-8 weeks, and color about 3x a year. I also have the expense of the Harklinikken treatment that I have discussed on Off-Topic. (continue to be extremely pleased with results)
Mani/Pedi - monthly. It's the lowest cost pampering available. I had my first pedi in my 40's so came to it late in life. Only clear polish - if any- on fingers, color on toes. With Angie on the well-groomed natural nails team.
Waxing - I discovered waxing in Brazil in my 20's. I could not believe it! In those days you used to go into a big common room and they'd slap you down on a table 2 feet on each side from the next one, and slather that wax on. It was so inexpensive there, but here it was out of reach cost-wise in younger years. I have DIY'd upper leg, bikini line, pits and lip for years, but if going on a vacation usually get professional help. There have been burns along the way.... As others have mentioned, hair has lessened in middle age, which is one of the only benefits of this period of life!
Facials - maybe once a year if at a spa. I really love it, but it's not a regular thing. Have been investing in laser light treatments (BBL - broadband light) for sun damage. Expensive and a little painful but the results are excellent.
Guys are so lucky.