Age... and Segmentation Fault

I'm trying to add customizable age, like "age 20" to set your age, and I've gotten it so far, by uh, copying the icq command in the finger file, and doing some other stuff my friends suggested, but it came out like crap and now you can only set your age higher than 60 ONCE, no less, and when you type age to see your current age, it comes out like 5840 for 90, and if you set 60, it comes out like 41.. That, and it won't write it to the pfile, like the icq command does.. Here's the crapped out code:

void do_age( CHAR_DATA *ch, char *argument )
{
int age;

if ( IS_NPC( ch ) )
return;

if ( argument[0] == '\0' )
{
if ( !ch->pcdata->age )
ch->pcdata->age = 5;
ch_printf( ch, "Your age is: %o\n\r", ch->pcdata->age );
return;
}

if ( !is_number( argument ) )
{
send_to_char( "You must enter numeric data.\n\r", ch );
return;
}

age = atoi( argument );

if ( age < 5 )
{
send_to_char( "Valid range is 4-90.\n\r", ch );
return;
}

if ( age > 90 )
{
send_to_char( "Valid range is 4-90.\n\r", ch );
return;
}

ch->pcdata->age = age;

if ( IS_IMMORTAL( ch ) );
{
save_char_obj( ch );
build_wizinfo( FALSE );
}

send_to_char( "Age set.\n\r", ch );
return;
}