It's a lifelong responsibility.
The four men became lifelong friends and fellow-workers.
The veterinary clinic was a lifelong dream he had attained.
The Henriade had got on considerably during the journey, and, according to his lifelong habit, the poet, with the help of his friend Thieriot and others, had been "working the oracle" of puffery.
Both Fred and Cynthia were smiling, lemonade in hand, like lifelong friends.