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<      ssh-agent [-a bind_address] [-c | -s ] [-d]
---
>      ssh-agent [-a bind_address] [-c | -s ] [-d] [-t life]
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>      -t life
>                         Set a default value for the maximum
>                         lifetime of identities added to the agent.
>                         The lifetime may be specified in seconds
>                         or in a time format specified in
>                         sshd_config(4).  A lifetime specified for
>                         an identity with ssh-add(1) overrides this
>                         value.  Without this option the default 
>                         maximum lifetime is forever.