The party's candidate for London mayor, Simon Hughes, said he would increase the availability of recreation facilities for young people if he was elected and would consult with young people throughout his election campaign.
Hughes unveiled the party's criminal justice policy, which would see tougher community service and restorative justice schemes used in preference to prison for minor offences.
Conference delegates backed calls for sex education to start at seven.
Liberal Democrat education spokesman Phil Willis said: "The rates of teenage pregnancy in this country are unacceptable. The quality and timing of sex education is a key factor."
The conference also marked the 100th anniversary of the party's youth wing, Liberal Democrat Youth and Students.
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