When I was RAPIDLY balding, I was losing up to 100 hairs a day, mostly in the shower. After finasteride I lose ZERO hair in the shower, and none that is noticable during the day.
Do not use that statistic to think shedding 50-100 hairs in the shower is somehow normal. It is not, and I do not care what this random statistic that is quoted everyday says. If you have this much loss then you need to start treatment ASAP if you want to keep your hair.
Try an experiment, dye one of your long hairs and see if it lasts 3 years. I’l bet you won’t see it in 3 years, or less. All body hairs cycle from a growth stage to a sleep stage and fall out during the sleep phase. We lose about 50-100 hairs a day and replace that number with new hairs each and every day.