Why is MegaSleep intended for people up to 75 years of age?

You did not include the name of the preparation in your question. If your question concerns MegaSleep labeled in tags, please read on. MegaSleep is a dietary supplement used in sleep and wakefulness disorders. Unfortunately, in the available studies I have not found a description in which the age limit is given when using the preparation. If you find a provision on the packaging that the preparation is intended for adults under 75 years of age, there may be several reasons for placing such a warning. One of them is, m.in, frequent multidrug treatment of people over 75 years of age, which increases the risk of interactions between the preparations used. The limitation may also be due to the lack of studies on safety and efficacy in this age group. I encourage you to read additional materials that may be useful: https://www.gdziepolek.pl/artykuly/bezsennosc