Is my daily bike route enough exercise for a 60 year old? Thank you for letting me join your group. I have a beach cruiser and I am currently riding 2,5 mies a day at a rate of about 13 mph constant with no stops. I am 60 years old and have been doing this for about a month is this enough?

I think it is enough for now, what I don't know is when should I increase or should I increase my distance. I have osteoarthritis and I take fish oil for that sometimes my knees hurt. Th distance I am riding now doesn't seem to irritate my knees.
Enough for a little expertise - yes, enough to train for a 100 mile ride, no. 

If you are just looking for some healthy exercise you can gradually increase distance and/or speed and back off if you over exert yourself. 

If you are unused to exercise or are not currently in great shape, you should consult a doctor before trying anything significantly harder than you are doing now.