35 and got floaters and I think flashes as I do not know exactly.

My advice would be to see a Retina Surgeon if you are at all worried.  I spent over 8yrs with a detached retina as every eye doctor I saw said the flashes I was seeing was either a schisis or posterior vitreous detachment, when in fact my retina had detached and it's now chronic and surgery will only make it worse.  I had never realised how many different specialists there are with eye doctors, even a retina specialist isn't able to diagnose things as specifically as a retina surgeon.

I don't get the flashing lights every time I blink, some days seem worse than others, I think it often depends on the light I am in at the time.  My symptoms started as seeing like a camera flash right on the edge of my vision, it would only happen when I went from a light room to a dark room so when they said it was posterior vitreous detachment I just assumed the diagnosis was correct, but to be on the safe side I went to see someone privately and that specialist told me I had a schisis which is a thinning of the retina.  For 8yrs the symptoms pretty much stayed the same until last year when I noticed some flickering in the periphery of my vision, so I went to the optician to get my eyes tested.  They did a field of vision test, something I hadn't had done before, and noted that I had lost 25% of my peripheral vision in the affected eye.  I was then given an urgent referral to my local eye hospital and saw 3 specialists before being referred to a retina surgeon from Moorfields and his diagnosis was that the damage to eye was from years ago, so most likely that was what my first symptoms were.  My vision is okay to be honest, I have to go back to see the specialist in December as he thinks to do surgery on the eye would mean I could lose my central vision, which would be worse than the peripheral vision I have lost.  If you have seen a retina surgeon and they have said your eye is fine then I'm sure it is, I don't want to worry anyone with vision problems but it does concern me that so many people don't see someone qualified enough to give a correct diagnosis.

I'm 63, so mine started when I was about 55.  I know that posterior vitreous detachment is common as we get older and it does give symptoms of flashes.  I forgot you mentioned floaters, I've always had floaters in the past, not a huge amount but enough to be annoying at times.  However in the last 8mths or so they are noticeably worse, it almost looks like snow when I look against a pure white background, but unless I do that I really don't notice them.