if (IsSavegameVersionBefore(SLV_LIFETIME_PROFIT)) {
        for (Vehicle *v : Vehicle::Iterate()) {
            YearMonthDay cur_date;
            ConvertDateToYMD(_date, &cur_date);
            YearMonthDay birth_date;
            ConvertDateToYMD(_date - v->age, &birth_date);
            if (cur_date.year - birth_date.year >= 2) {
                v->profit_lifetime = v->profit_last_year;
            } else {
                v->profit_lifetime = 0;
            }
        }
    }