This issue was hotly debated here about a year ago. If I remember correctly (I'm on another computer so access is limited) the stock that was destroyed as carriers were from two of the three major CA nurseries. The third was certified virus-free. Stock from other states, such as Texas and Florida, was unaffected. Where I live there are a lot of the original Meyers still around. The East Bay was still mostly small homes (on what is today large urban lots) and rural farms until the late 1960's; the Warren Freeway section of Hwy 580 was not completed until the mid-1970's. I don't see any reason why a Meyer wouldn't live 50-75 yrs if properly fed (and that's a big IF, most people don't feed their Meyers as much as they should). The older citrus trees in our area were all planted in the 1930's and 1940's, and are still going like gangbusters today. One of my co-workers who lived in Concord in the mid-1990's had a home in a former orchard-turned-development, and said there were Meyer trees all over her area. The trees bore great big gorgeous lemons year-round. A neighbor across the street from her, who was born and raised in one of the original tiny cottages circa 1920, said she remembered when the Meyer orchard was planted in the 1930's, and watched as the owner sold off the land to developers in the 1970's and most of the trees were bulldozed.

Not leaf miner; miners work inside the leaf. This is the result of something chewing the top surface of the leaf, allowing the sun to bleach the inside.

Oh god, hopefully is edema and not some fungus that could attack mu entire collection. I already try to spray my tree with a fungicide called "safer defender". It's a fungicide with sulfer and I didn't see amy improvement. Do you think that I should tru a copper based fungicide just to safer? Thank you for your input!

Looks like classic spider mite; you will need a 10X loupe to see them. Much advice on this site for spider mite treatment.