Mine were different. ages and I did nothing different.
Dd1 crawled at 9 months, walked at 15 months. But once she'd walked, she never crawled again. She walked miles, with scarcely a tumble. She's still like that at 18yo: she'll be slow to start something, and will wait until she knows she can do it all without ay issues before she begins.
Dd2 crawled at 5 months and walked at 8 months which is a nightmare I wouldn't wish on anyone. She had a lot of falls, and also if she was ill/tired, she went back to crawling until she was nearly 2yo. She still tends to launch herself headlong without thinking of the consequences.
Ds crawled at 6 months and first walked at 10 months. He could walk anywhere by 11 months but generally chose not to as he far preferred to crawl as he could then push a toy car in each hand. He was about 18 months before he would choose to walk most of the time.
He now prefers planes to cars but still likes to take the easy way round anything.
With none of them I did anything special. Ditto talking: they were all good talkers, in full sentences by 18 months. Did nothing special to help.
I think generally you can't get them doing it earlier, but you can discourage them. I've a friend who had laminate flooring and no shoes rule in her house. It was a few years before she linked the slippery socks on laminate floor with her dc's late walking. 
However if you are giving them things to pull up on, not crying out in panic if they try and stand on their own and hold hands and walk with them when they're ready, you're doing all anyone can do.