That is some healthy growth. When i started when i was 11, i mowed with a friend for 3 years, when he got his license he was sick of mowing and wanted to get a real job but wanted me , a 14 year old to buy him out for 10k. Yea right did i have that much money. So we arent friends anymore and i has to start over. I have about 15 lawns when i was 15, the following year, and when i turned 16, i advertised liked crazy and grew to 60 accounts, and then held that steady while getting more landscape jobs and now we are at 115 ish, and looking to add another 40 lawns this year for a full lawn route. And a full landscape route hopefully.