Ok, you're good there. I bought a 'new' tire once that was 5yrs old. Dropped it in a 25mph right turn because it was so hard.
I have seen the tiny cracks in the rubber that run along the rim on cars. Never seen a failure. I'm sure you will be fine as long as you keep an eye on them and they don't appear to be getting bigger.
The front ME880's on my Honda would last about 25K miles. It was almost due for another one when I sold it.
2007 V2K, Pearl White/Ti, Road Burner 3", Fi2000, Euro gears, Double Darkside (totaled 4/25/15)
1998 STX 1100 JETSKI (HERS)
1996 ZXi 1100 JETSKI
1982 GL500 SILVERWING (sold)
1983 JEEP WAGONEER