I'll put it this way … the more you do it, the more your body is going to produce the hormones necessary to be able to do it more frequently. There's less testosterone production as you get older, it's true, but you can combat this with good nutrition, exercise (strength training is very important), and cumming. FREQUENTLY.
Your body will see a slight drop in T-levels immediately after ejaculation, but that's very brief. If you're in the habit of cumming daily, your standard rate of testosterone production is just going to climb and climb. Testosterone production goes up if you keep your plumbing in active use.
Even if it means jacking off every day, when you're alone ... it's better to make sure to ejaculate at LEAST once per day (I shoot for three times) than zero times. Less cumming means your body is going to want to cum less often over time.
There's some kind of new straightedge "movement" among young men online (there's a subreddit dedicated to it, even, called NoFap), where they trick themselves into believing ideas that have LONG AGO been debunked by science, and try to train themselves to not masturbate. They think it gives them more energy (bullshit talk from the 1920s), that each ejaculation means lost stamina. Some do it for religious reasons, others because of completely secular ideas about masculinity and the "lameness" of needing to pleasure oneself.
Whatever their motives, they are ALWAYS misguided. Cum as much as you can (within reason, don't do it in public and don't miss work over it, and don't physically injure yourself, haha). Keep your T-levels up. Make it an automatic thing before you go to bed.
I've been with older guys before; some were still stallions and wanted to keep going time after time. Other much younger men gave me a saved-up load that they had built up over the course of an entire week, and calmly informed me that they were going to be "fine" with that ejaculation for at least three days. That depressed me. It's not necessarily about diversity amongst men, either ... every time I've dug more into the reasons behind this, I always find out it's because the guys have never shaken their 12-year-old guilt about masturbating, and trained themselves to not do it until the absolute last minute.
MISTAKE.
One final thought -- I'm sure we've all met elderly men, grandpa types, that are very sweet and funny people, personable, and fun to talk to. We've also met the grumpy assholes that yell at kids to get off their lawns. The difference between the two types is testosterone levels.
A guy in his 70s that still loves to squeeze one out in the shower every morning is the sweet lovable old guy, and the ones yelling at kids to get off their lawns are the ones that stopped jerking off because it was for "hippies" or "perverts." I guarantee it.