I started cycling about 8 months ago and have been getting more and more into it each month. I currently ride about 50 miles a week. (On a trainer now that it's cold.) I started out around 10mph and now can easily handle 16mph with intervals up to 22-24mph. I ride 30-60 minutes at least three times a week with a few spinervals and/or sufferfest videos thrown in and a longer 60-90 minutes ride at least once on the weekends.

I see other's, who I presume have been riding much much longer, easily reach and 25+mph average over an hour.

I don't expect to magically jump up to a 20+mph average but assuming I continue riding at my currently pace and miles can I realistically expect to reach a 20+mph average any time soon? How much do I need to increase my riding to get there? Am I on the right track after only 8 months of riding?