As others mentioned, do look for other causes of fatigue because that can happen for a variety of reasons.
Having said that, around 6 months into my 3 years of ADT the fatigue began to set in. Shortly after it began, it became almost debilitating. I was always tired, and would go to bed by about
8:30pm sleeping until the 6am alarm. Every night. It became almost a standing joke between my wife and I! Driving was difficult, since I could only take about
45 minutes at the wheel before getting sleepy. My wife would take over and I'd conk right out for 1/2 hour or so. Exercise helped, but was nowhere near enough to counter the ADT fatigue for me.
Since my T recovered quickly (surprisingly) after ADT, I was back to "normal" not long after. I can drive all day now, and live on about
6-1/2 hours of sleep a night. I have plenty of energy and motivation to do things again. It wasn't "age" in my case. Of course I was lucky enough to be diagnosed at 55, so yay me; can't really speak for one perhaps in late 70s or beyond. Our bodies do change over time, too.
Hot flashes are annoying, but you can live with them. That fatigue tho....
55@Dx on 4/16/13. PSA 5.2, G9(5+4), PNI+, cT3a by MRI.
IGRT - 44 sessions (79.2 Gy, 50.4 Gy pelvic)
ADT2 - Lupron+Casodex (5/13-3/16)
8/13-5/16 <0.1 (ADT2)
5/16-3/17 recovering from ADT2
3/17-7/18 ~ 0.6 - 0.8 (no TX)
10/18 = 1.0, 12/18 = 0.9My Story