Determine when an individual is required to file a tax return for 2022:

1. At what gross income level is a 69 year old head of household filer legally required to file a tax return?

2. At what gross income level are a 56 and 62 year old married couple filing a joint return legally required to file a tax return, if one of the spouses is blind.

3. At what gross income level is a 60 year old surviving spouse with a dependent child legally required to file a tax return