| activity_id | user_id | activity_type | time_spent | | ----------- | ------- | ------------- | ---------- | | 7274 | 123 | open | 4.5 | | 2425 | 123 | send | 3.5 | | 1413 | 456 | send | 5.67 | | 2536 | 456 | open | 3 | | 8564 | 456 | send | 8.24 | | 5235 | 789 | send | 6.24 | | 4251 | 123 | open | 1.25 | | 1435 | 789 | open | 5.25 |

| user_id | age_bucket | | ------- | ---------- | | 123 | 31-35 | | 789 | 21-25 | | 456 | 26-30 |