ptosis at young age due to weak levator muscle

[Martian]

I have got ptosis or droopy eyelid on my left eye since about 15. Ive googled about ptosis which from my understanding is pretty rare at this young age. I read somewhere else that in most cases these young "ptosis" cases is just your levator palpebrae superioris muscle being weak due to an injury or such. Is there any effective exercises you can do to strengthen this muscle? Anyone else got this?