She enjoys weekend retreats to her Gloucestershire farmhouse, is a dedicated mother and likes to use a pony and trap for trips to her local pub. But Kate Moss says her partying days are far from over.

In a rare interview, the 34-year-old supermodel reveals that while the younger clientele at her favourite London party spots sometimes make her feel old, she is not about to grow old gracefully. "I am still acting like a 17-year-old. I definitely haven't become middle-aged," she told American Vogue magazine. "I've got a house and a daughter and all that, but I still like to have fun. Even in my business we still have fun."

Apart from the cocktail circuit, that fun includes using some of her estimated £45m fortune to splash out on some extravagant toys, including a private jet. "I'm going to call it the 'Kate Express'," she said.

A classic Rolls-Royce is also on her shopping list. She said: "I am looking for an old Seventies Corniche. It's a Rolls-Royce. I want one for the country. That's what I'd like to buy now."

Moss recently bought a Hackney cab, which she uses to take her friends to favoured night spots.

"I like making money, but I don't call people up every day to see how much I've made. I am not completely money-oriented," she said in the interview, which appears in the August edition of the magazine. She admitted that her attitude to money had changed since she was in her twenties, when she preferred to spend thousands on earrings and handbags during shopping trips to Paris. As for her smoking habit, she has no intention of quitting. "It's who I am," she said. "I don't want to create a phoney facade. I think I just have to be myself; otherwise, I'd be a paranoid mess."

While she still lives life in the fast lane, Croydon-born Moss said that her five-year-old daughter, Lila Grace, was her priority. "I'm a mum. All the time," she said. "Every day I put my daughter to bed. And weekends we go off to my other place in Gloucestershire where I keep most of my clothes in a massive room that's just rails. When we're there we take a neighbour's pony and trap to the pub." She said she was considering a permanent move to the countryside, to allow her daughter to have an idyllic, rural childhood.

The model, who has become a designer for Top Shop, said her range for the high street store was continuing to fly off the shelves. She said that about £20m of clothes from her range had been sold since it was launched last year. While Moss said she still enjoys modelling, she admits she made the move into designing after finding endless catwalk and fashion shoots too "brain-damaging".

"It inspires me for the other things as well," she said. "All that dressing up makes me say, 'What do I want to wear?' It all kind of leads into the other things."

She added that there were limits to her wish to stay young, telling the magazine she would never be turning to Botox injections in an attempt to retain a youthful look because she would be "really embarrassed" if she was unable to frown when asked to by a photographer.

Moss was 14 when Sarah Doukas, the founder of Storm Model Management, spotted her as she passed through JFK airport on her way home from a holiday in the Bahamas in 1988.

She has remained in the headlines ever since, and while newspaper allegations that she had a cocaine habit lost her some high-profile clients, she is still the world's second highest-earning model, according to Forbes magazine, which claimed in 2007 that she earned $9m a year.