I started road cycling last year and went from 36 miles max solo distance to 100 in 3 months last summer after asking for century prep advice on BF. Added 10-20 miles each weekend with only ill effect being one ride where I didn't eat enough and had to skip a final planned climb. Definitely nutrition, hydration, and comfort were more things I needed to get used to than any rigorous physical training.

Edit to add that my biggest jump was my first training ride, where I went 30 miles over previous max on a route with a lot of climbing. Took my time and focused more on enjoying the ride with my then-new bike computer, rather than speed or time.