Charging less for children, families and the elderly is the same thing. Charging less for women in clubs. Same with booking hotels and flights, based on browsing history, IP address, cookies and the extrapolated demographic.
Even a repair contractor adjusts his prices up for someone who lives in a mansion with expensive cars in the driveway, and down for a single mother with three young kids running around her.
Of course Tinder charges more for older men, why wouldn't they. Every industry ever wanted to be able to do this, and some can now automate it easily with all the available demographic data they collect.