hmm, age differential? I'm 55 & went I started sewing, stamps were 5¢. Fabric was under $1/yc. Are these older ladies?
Your obligation is to you, your family & your equipment. Do your research, write up a price list. Until you know what you charge, just say, I'm still researching, I will get back to you.
Self employed people need to make a living wage, enough to pay social security (was 15.3%, but FICA ee went down), state, federal taxes, supplies, for VACATIONS, RETIREMENT and EQUIPMENT. If you are worth $15, so is your machine, and that is $30 per hour. lol - can you tell what I do for a living? (accounting)