That's tough but not impossible. My state representative (equivalent to your assembaly) was just re-elected at 24. He won his first term at 22.
It is a mix of exurban and rural areas in my district. My rep won his first race against 5 primary opponents (4 of them elected county or township officials). He also defeated the democrat by a 2.5-1 margin. All candidates except possibly two were conservatives, and all ran as conservatives (all claimed to be pro-life and pro-2a) so ideology was not a real issue here either.
My rep won his first race by knocking on 15,000 doors and being a life long resident of a very tight knit agricultural based small town community. Most active residents knew him, or knew his parents, aunts, uncles, etc. It was a classic case of small town politics.
The other state rep in my county won his first state rep race at 28. He had held an elected position since he was 18 when he won a race for township trustee.
That is the exception and not the rule. If you want to be a state rep at 26, you should probably run for a county, city, or township office at 21 or so. A state rep race in my area of Michigan usually cost $30,000 or more. In the Detroit area, it costs more. In California, I'm sure it's even more. My state rep won his race with $10,000.(most spend $25,000 in the PRIMARY).
I hope I'm not overwhelming you here, but campaigns take a lot of hard work, smart work, planning, good people backing you, the right demographics, and a little luck as well.