irrespective of / regardless of

1a. They are protected by the law, irrespective of race.
1b. They are protected by the law, regardless of race.
2a. The club welcomes all new members irrespective of age.
2b. The club welcomes all new members regardless of age.
3a. He went ahead and did it, irrespective of the consequences.
3b. He went ahead and did it, regardless of the consequences.
Please correct all.
Thanks.

They’re okay.

When the question of consequences comes, I think 3b is preferable to 3a.

Beeesneees/Anglophile,
‘I tell them the truth, regardless of what will happen to me.’
Is this sentence OK?
Thanks.

I’ll tell them the truth, regardless of what happens (may happen) to me.

Beeesneees/Anglophile,
‘I will go to the movie whether you come with me or not.’
Please rephrase the above sentence using ‘irrespective of’.
Thanks.

I will go to the movies, irrespective of whether you decide to come with me.
I will go to the movies, irrespective of whether you come or not.
I will go to the movies, irrespective of your decision.
I will go to the movies, irrespective of what you decide to do.

Allifathima, some points about the earlier posts:

Both are possible just as you originally wrote.

This is acceptable grammatically in terms of narrative about what you are doing now. There may be no need to change the tense as suggested, because that simply changes the way in which it is used.