Is the age at surgery in Crohn's disease clinically relevant? Differences and peculiarities: a wide single centre experience after long-term follow-up

Purpose The Montreal classification for Crohn's disease includes "age at diagnosis" as a parameter but few is reported about the age at surgery. The aim of this study is to evaluate the short- and long-term differences in the postoperative surgical outcome and disease behaviour, according to the age at the first surgery. Methods Patients consecutively operated for abdominal Crohn's disease during the period 1986-2012 at our centre were systematically analysed according to their age at first surgery. In our retrospective cohort, the age at first surgery ranged from 13 to 83 years, and patients were arbitrarily divided into four groups: <= 19 (G1), 20-39 (G2), 40-59 (G3) and >= 60 (G4) years old. Results In total, 1051 patients were included with a median follow-up time of 232 months. The four groups exhibited statistically significant differences in age at diagnosis, smoke habit, time between diagnosis and surgery, disease location and behaviour, history of perianal fistula or abscess, severe malnutrition requiring total parental nutrition before surgery, type of surgery, total length of resected bowel, median duration of hospitalization, incidence of abdominal recurrences and number of surgical recurrences. G1 displays an inverse linear trend with time in the severity of clinical characteristics when compared to G4 groups. On the contrary, the incidence of short-term complications, types of abdominal recurrence and presence of concomitant perianal disease did not vary among groups. In addition, at multivariate analysis, the age at surgery and the disease location were the only independent risk factors for abdominal surgical recurrence. Conclusion Despite first surgery is extremely more frequent between 20 and 59 years, patients from G1 and G4 groups showed clinical differences and peculiarities when compared to the other age groups. The most indolent CD behaviour and occurrence of surgical recurrence was observed in patients having their first abdominal surgery in the elderly, while patients operated before the age of 19 experienced a more aggressive disease course.