I did one in July. 32 years old, but had never had the money to run a car so had never gotten my licence. I had to wait 12 weeks for the course though due to the wait for a driving test in the North East. The instructor said I was test ready after about 12-15 hours but I had paid 1k for the full 40 so did lots of mock tests, and she let me just practice stuff I wanted to (lots of reverse and parallel parking to make sure I was happy with it). Passed first time, 2 minors.
Couple of things to note, I didn't particularly get on with my instructor, she'd shout occasionally with no real reason, and actually hit me a couple of times. If it wasn't an intensive course that I knew would have been finished in a week I'd have found another instructor after the first few lessons. So just be mindful that if your instructor isn't to your liking you'll have to lump it, basically. Second thing, and this is going to sound daft. It's intense. I know the clue is in the name but I found it quite exhausting. And I'm an endurance cyclist used to 7 day events etc. The combination of concentration, stress, learning something new and doing it for 7 hours a day was hard work. I was really tired at the end.
I'd still recommend an intensive course though. Gets it out of the way. I'd have struggled to do it week to week with other commitments. I just booked a week off work.
So happy I did it as well. Absolutely love driving. The freedom is great, and it's just so much fun. I'm currently driving the wifes 1.2 Fiesta which is utterly gutless but I'm sure next year I'll be in Motors asking for advice, then promptly ignoring it, buying something stupid and annoying [TW]Fox.