Marfan Syndrome + Shortened Life Span?

I've read that this syndrome can cut down your life span, but I was wondering if anyone knew by how much ? For example, if someone in their early 20s was diagnosed with it, but only with 2 leaky heart valves and their aorta looked fine (from ecg) what would the expected life span be ? (if any change assuming... show more I've read that this syndrome can cut down your life span, but I was wondering if anyone knew by how much ?

For example, if someone in their early 20s was diagnosed with it, but only with 2 leaky heart valves and their aorta looked fine (from ecg) what would the expected life span be ? (if any change assuming no other major illnesses / incidents)
Update: Edit : I will be asking a doctor tomorrow I was just thinking of it and wondered if anyone had a temporary answer :)
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