sql - AVG only valid dates -


i have simple search query one:

 select count(id),         count(case when nation = 'german' 1 end),         count(case when nation = 'french' 1 end),          avg(age(birthday))   persons;

my problem error:

  error: date out of range timestamp

i suppose error because not every person has birthday saved.

birthday date-field

how can prevent error, , average birthdays valid dates?thanks

how this:

select count(id),         count(case when nation = 'german' 1 end),         count(case when nation = 'french' 1 end),          avg(age(coalesce(birthday, 0) ))   persons birthday not null;

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