Hello Linda and a belated welcome as I've just been on holiday.
My husband had permanent seed Brachytherapy in June 2014 (check out our profile - sorry it's a bit long ended as I tend to use it as a diary !)
He is now 75. Would he still have had the (relatively) mild side effects had he been a younger man, who knows.
We are coming up for two years now post procedure and really there isn't any major difference and what we do notice may well have happened anyway due to his age. (ED)
Yes, there is the possibility that at some stage in the future he may develop bowel cancer, but the NOW is real and he is still with me and still driving me mad!
The tiredness will fade. After all, it may not be the full monty as far as surgery is concerned, but it is still an invasion which is going to have ongoing side effects for a while - certainly while the seeds are at their strongest.
It will get better though (unless he is very unlucky like sjtb's husband). Having said that, John does seem to get tired moire easily these days but then he is 75 and no spring chicken.
There are a number of men on here having had the seed brachytherapy but off the top of my head (and following a large glass of post holiday wine !!) the only other one I can currently think of is kennt, so you could check his profile too