diff --git a/src/api/main.py b/src/api/main.py
index 0d96293..16b1fee 100644
--- a/src/api/main.py
+++ b/src/api/main.py
@@ -24,7 +24,7 @@ from api.auth import get_current_user, resolve_account_for_user
 from api.schemas import ContactListResponse, ContactOut, SyncRunOut
 from config import Config
 from mailer import build_message, fetch_birthdays_for_date, send_message
-from utils import fmt_birthday_age, fmt_birthday_short
+from utils import fmt_birthday_age, fmt_birthday_short, is_unknown_year
 
 logging.basicConfig(level=Config.LOG_LEVEL, format="%(asctime)s [%(levelname)s] %(message)s")
 logger = logging.getLogger("api")
@@ -36,6 +36,7 @@ templates = Jinja2Templates(directory="api/templates")
 templates.env.filters["urlquote"] = lambda s: quote_plus(s or "")
 templates.env.filters["fmt_birthday"] = fmt_birthday_short
 templates.env.filters["fmt_age"] = fmt_birthday_age
+templates.env.filters["has_year"] = lambda b: not is_unknown_year(b)
 
 
 def _fmt_ts(dt) -> str | None:
diff --git a/src/api/templates/dashboard.html b/src/api/templates/dashboard.html
index c1061a3..db91946 100644
--- a/src/api/templates/dashboard.html
+++ b/src/api/templates/dashboard.html
@@ -367,7 +367,7 @@
                             <div class="birthday-organization">{{ b.organization }}</div>
                             {% endif %}
                             <div class="birthday-date">
-                                {{ b.birthday|fmt_birthday }}{% if b.birthday|fmt_age %} · {{ b.birthday|fmt_age(current_year) }} Jahre{% endif %}
+                                {{ b.birthday|fmt_birthday }}{% if b.birthday|has_year %} · {{ b.birthday|fmt_age(current_year) }} Jahre{% endif %}
                             </div>
                         </div>
                         {% if b.photo_url %}